ChatGPT deep researchFree plan
Paid from
$20 a month
View plans and limitsUpdated 4 September 2026 · Independent comparison
ChatGPT deep research vs OpenEvidence:
which should you use?
ChatGPT deep research and OpenEvidence, side by side. Find the one that fits what you need to do.
Find your best fitThe 30-second answer
ChatGPT deep research long autonomous research runs that produce a cited write-up.
OpenEvidence is built for search, research & academics.
Pricing, simplified
Start free. Upgrade when you need more.
OpenEvidenceFree plan
Pricing
No verified ladder yet
View plans and limitsThe 30-second comparison
If you only read one section, make it this one. Rows where both sides say the same thing are left out — the point is where they differ. Where each row came from is listed underneath.
| Category | ChatGPT deep research | OpenEvidence | Better fit |
|---|---|---|---|
| What it's built for | Long autonomous research runs that produce a cited write-up. Useful for scoping a topic before you commit to reading. | Built for clinical literature. Answers cite primary medical research, and it is free for verified clinicians. | OpenEvidence |
| Fit for search, research & academics | Strong fit | Built for this | OpenEvidence |
| Free plan | Yes. A small number of deep research runs on the free ChatGPT tier | Yes. Free for verified clinicians, ad-supported | Tie |
| Cheapest way to pay | $20 a month. | No paid tier — it is free. | OpenEvidence |
| What the paid tiers cost |
| No paid tier — it is free. | Tie |
| What to watch out for | Web-first rather than database-first. Verify every citation before it enters a bibliography. There is no separate deep research plan: more runs come with a ChatGPT subscription. | Medicine only, and access is gated behind clinician verification. No use for a history or engineering student. | Tie |
| Who it is usually for | students, researchers, working professionals | researchers, working professionals | Tie |
| Made by | OpenAI — San Francisco, US. | OpenEvidence — Cambridge, US. | Tie |
OpenEvidence is ahead on 3 of the 8 rows compared, 2 of them about how well it does the job itself. That is a clear lead rather than a tiebreaker.
OpenEvidence
Built for clinical literature.
✓ The job is mainly search, research & academics
✓ Built for clinical literature.
✓ You would rather not take on a subscription at all
✓ It is built for search, research & academics
Long autonomous research runs that produce a cited write-up.
ChatGPT deep research is the better answer when the job is what it was built for rather than what the pick above does broadly.
✓ Long autonomous research runs that produce a cited write-up.
✓ You are among students
✓ Useful for scoping a topic before you commit to reading.
✓ A small number of deep research runs on the free ChatGPT tier
How we know
Every row that separated these two, and where it came from. Nothing here is a hands-on test — if a line rests on a vendor’s own pricing page, it says so and links it.
| Row | Favours | Weight | Where it came from |
|---|---|---|---|
| What it's built for | OpenEvidence | How well it does the job | From this site’s own catalogue record for each product — compiled by hand, not imported. How a product gets listed |
| Fit for search, research & academics | OpenEvidence | How well it does the job | Both products are listed under search, research & academics in the catalogue, and this is the fit recorded against each listing. Everything listed under search, research & academics |
| Cheapest way to pay | OpenEvidence | Everything else | From each vendor’s own pricing page. Dates and pages are listed below. |
The prices
ChatGPT deep research. Read by hand off chatgpt.com on 4 September 2026. It is not on the monthly re-check, so confirm there before paying. chatgpt.com
OpenEvidence. Read by hand on 4 September 2026, because OpenEvidence cannot be read automatically: Free for verified clinicians, no paid tier — nothing priced to watch openevidence.com/pricing
The ratings
The category these two share. Search, Research & Academics — both are listed there in the catalogue, and the fit recorded against each listing is a judgement made here, by hand.
The nine-category grid below. Derived from what each product is listed for, by one script, once per build — so the same pair always reads the same. It is a derivation, not a review.
What this is not
Neither product was run side by side to produce this page. Nobody was paid to appear on it and nothing here is ranked by commission.
To put the same question to both and read the answers yourself, run them side by side — that is a live test, and this is not.
Choose based on what you’re doing
All ten categories, including the ones where neither of these is the answer. These ratings are derived from what each product is listed for, not from running it — a rating here is a reading of the record, and the record is linked.
01
General-Purpose AI Assistants
Questions, brainstorming, explanations, everyday tasks, decision-making, general advice.
ChatGPT deep research
Not a good fitOpenEvidence
Not a good fitBest choice: Neither
02
Search, Research & Academics
Web research, deep research, books, academic papers, citations, news, fact-checking.
ChatGPT deep research
Good fitOpenEvidence
Built for thisBest choice: OpenEvidence
03
Writing, Communication & Language
Emails, reports, essays, editing, summarizing, translation, presentations.
ChatGPT deep research
Not a good fitOpenEvidence
Not a good fitBest choice: Neither
04
Coding, Data & Technical Work
Programming, debugging, data analysis, spreadsheets, math, engineering, technical research.
ChatGPT deep research
Bad fitOpenEvidence
Bad fitBest choice: Neither
05
Business, Finance & Professional Work
Business strategy, investing, market research, legal, sales, HR, accounting, consulting.
ChatGPT deep research
Not a good fitOpenEvidence
Not a good fitBest choice: Neither
06
Image & Design
Image generation, photo editing, logos, graphics, product design, advertising creatives.
ChatGPT deep research
Bad fitOpenEvidence
Bad fitBest choice: Neither
07
Video
Video generation and editing, clipping, subtitles, avatars, animation and motion capture.
ChatGPT deep research
Bad fitOpenEvidence
Bad fitBest choice: Neither
08
Audio, Voice & Music
Voice generation, transcription, music, dubbing, sound cleanup and podcast production.
ChatGPT deep research
Bad fitOpenEvidence
Bad fitBest choice: Neither
09
Marketing & Content Creation
Social media, SEO, advertising, copywriting, content ideas, scripts, brand development.
ChatGPT deep research
Bad fitOpenEvidence
Bad fitBest choice: Neither
10
Productivity, Automation & Personal Life
AI agents, workflows, scheduling, meetings, organization, shopping, travel, personal finance.
ChatGPT deep research
Not a good fitOpenEvidence
Not a good fitBest choice: Neither
Long autonomous research runs that produce a cited write-up.
by OpenAILong autonomous research runs that produce a cited write-up.
You are among students
Useful for scoping a topic before you commit to reading.
A small number of deep research runs on the free ChatGPT tier
Built for clinical literature.
Cambridge, USThe job is mainly search, research & academics
Built for clinical literature.
You would rather not take on a subscription at all
It is built for search, research & academics
Pricing, simplified
The plans people actually compare, read from each vendor’s own page.
PricingSimple, up-to-date plan overview.
ChatGPT deep researchby OpenAI
OpenEvidenceby OpenEvidenceFree version
ChatGPT deep research
Yes — Free plan availableA small number of deep research runs on the free ChatGPT tier
OpenEvidence
Yes — Free plan availableFree for verified clinicians, ad-supported
Individual plans
ChatGPT deep research
ChatGPT Plus
$20 / month
ChatGPT Pro
$100 / monthor $200 / month
OpenEvidenceFree plan only
Business plans
ChatGPT deep research
From $25 / user / monthFrom $20 / user / month (annual)ChatGPT Business
OpenEvidenceNot sold to teams
Enterprise
ChatGPT deep researchNot published
OpenEvidenceNot published
View full details
ChatGPT deep researchView ChatGPT deep research pricing
OpenEvidenceView OpenEvidence pricing
Tell us what you use AI for
Pick your main job and the verdict below changes to match. Every answer is on the page already, so this works as a reader, not a lookup.
The verdict for that job
OpenEvidence
OpenEvidence. It is built for search, research & academics; ChatGPT deep research does it well without it being its focus; both have a free plan you can start on.
8 rows compared
Frequently asked questions
Is ChatGPT deep research or OpenEvidence better?
OpenEvidence is ahead on 3 of the 8 rows compared, 2 of them about how well it does the job itself. That is a clear lead rather than a tiebreaker. OpenEvidence is built for search, research & academics; ChatGPT deep research does it well without it being its focus; both have a free plan you can start on. ChatGPT deep research: Long autonomous research runs that produce a cited write-up. Useful for scoping a topic before you commit to reading. OpenEvidence: Built for clinical literature. Answers cite primary medical research, and it is free for verified clinicians.
Is ChatGPT deep research or OpenEvidence cheaper?
Only one of the two publishes a ladder we have verified, so a like-for-like comparison is not possible yet.
Do ChatGPT deep research and OpenEvidence both have free plans?
Yes. ChatGPT deep research: A small number of deep research runs on the free ChatGPT tier. OpenEvidence: Free for verified clinicians, ad-supported.
What should I watch out for?
ChatGPT deep research: Web-first rather than database-first. Verify every citation before it enters a bibliography. There is no separate deep research plan: more runs come with a ChatGPT subscription. OpenEvidence: Medicine only, and access is gated behind clinician verification. No use for a history or engineering student.
Read more
ChatGPT deep research
What it is for, who makes it, what it costs and what to use instead.
OpenEvidence
What it is for, who makes it, what it costs and what to use instead.
Best AI for Research
Web research, deep research, books, academic papers, citations, news, fact-checking.